Stapling and tacking machine



May 1l, 1937. A. l.. HANSEN STAPLING AND TACKING MACHINE Filed Feb. l5, 1936 www" May 11, 1937. A HANSEN 2,080,130

STAPLING AND TACKING MACHINE Filed Feb. l5, 1956 ESheetsvSheet'Z Patented May 11, 1937 PATENT OFFICE STAPLING AND TACKING Augie L. Hansen, Chicago, Ill., assignor to A. L. Hansen Mfg. Co., Chicago, Ill., a corporation oi Illinois Application February 15, 1936, Serial No. 63,996

9 Claims.

This invention relates to staple driving machines of the tacker type and consists of the matters hereinafter described and more particularly pointed out in the appended claims.

The subject matter of the present invention is illustrated herein as applied to a stapling or tacking machine of the type disclosed in the patent to Hugo J. Baur, No. 1,978,983, October 30, 1934. In such machine, particularly when designed as a tacker, Where the staple is driven its full length, Without clinching, into wood, hard berboard, or like tough, resistant material, the driving member or plunger, arrested in its full driving movement at the end of its stroke by parts of the base of the tacker, produces such pounding against said parts, made necessarily of light metal, with a resulting vibration, that crystallization of the metal of said parts soon follows and breakage occurs. The life of such stapling machine and/or tacker is thus greatly shortened and repairs or renewal are diiiicult and expensive.

The object of the present invention is to provide a stapling machine or tacker of the kind, with parts so constructed and combined that said pounding, with resultant crystallization of parts, will be relieved and/or compensated for, so that there will be little or no such crystallization, with the result that the life of the machine is greatly extended.

, The advantages of the invention will appear more fully as I proceed with my description or the improvements in detail.

In the drawings:-

Figure 1 is a perspective view of a stapling or tacking machine embodying the invention;

Figure 2 is a View representing a longitudinal vertical section through the machine in a median vertical plane thereof, with the parts in normal position;

Figure 3 is a similar view with the plunger driving member withdrawn to the position where it is released for driving the staple;

Figure 4 is a vertical section of the machine in a plane indicated by the line 4 4 of Figure 3 Figure 5 is a partial section of the machine in a plane indicated by the line 5-5 of Figure 3, with the parts shown in the position when the driving blade has driven the staple almost to the position of engagement with the article into which the staple is to be driven;

Figure 6 is a section in a plane indicated by the line 6-6 of Figure 3, with the parts in position as when the plunger has completed its stroke to drive the staple home, with the driving blade broken away;

Figure 7 is a perspective view of a yoke used in the construction;

Figure 8 is a perspective View of a pad designed to receive the direct shock at the end of the stroke of the hammer; and

Figure 9 is a view representing a cross section through the base of the stapling machine in a plane indicated by the line 9-9 of Figure 1.

Referring now tothat embodiment of the invention illustrated in the drawingsz--I 0 indicates the base of the improved staple driving or tacking machine; I I indicates a handle carried thereby; I2 indicates a tubular head at the driving end of the base, which head houses the driving plunger and the spring for driving it and provides an abutment for the top end of said spring; I3 indicates an operating lever to be gripped by the palm of the hand with the ngers engaged below the handle II when operating the plunger ,to drive a staple; I4 indicates a spring-controlled linkage connecting the lever I3 to a pawl I5 which raises the plunger and releases it at a predetermined point; and I6, I6 indicate spaced, upright wings extending rearwardly from the head I2, which wings provide support for the lever I3, the linkage I4 and pawl I5, and have an arbor on which is mounted the coiled spring I'I, which acts to feed the staples to be driven.

The base Il), as shown, comprises a shell or shoe 23 and a housing including channel plates I9, I9 and Illa., IIla,'which provide the horizontal Way through Which the staples are fed to the vertical driveway between front and rear jaws 20, 2| fixed to the front end of the channel bars I9, I9. from the plunger and operating through said vertical driveway. The shoe 23 Iof the base I0 is in the form of a channel bar having a bottom wall 24 and upright side flanges 23a, 23a. The tubular head I2 is open at the top end I2a, which is closed by a tubular cap 26 telescoped thereon. 21 indicates a coiled spring interposed between the top end 25a; of the cap 26 and the top end I2a of the tubular head I2.

28 indicates the driving plunger, to the bottom end of which is iixed the driving blade 22. Said plunger has a vertical stem 29 which is preferably slidable within a guide tube 30 having a tcp flange 30a. 3l indicates a heavy coiled spring interposed between the top end of the cap 26 (which provides its top seat) and the top of the plunger 28. The intermediate flange 30a of the guide tube 30, which directly seats the spring, is centered by a central depression 26h in the top end 26a of said cap. 32 indicates 22 indicates the driving blade depending a yoke having a cross member 32a engaged with the top 28a of the cap 28 and having its legs 32h, 32h extended down at the sides of the head I2 towards the base IU. Said legs are pivotally connected at their bottom ends by a pin and slot connection 33, 33 to upwardly projecting ears 34, 34 rising from the forward ends of the side iianges 23a, 23a of the shoe' 23: The slots are for the purpose of Vdepressing the yoke to remove the cap when assembling or replacing the springs in the head I2. The bottom wall 24 of the base is notched out at its forward` end,.

feed spring I I 'and the forward end `of the handle |I,-are.made rigid with andare preferably integral with laterally spaced bars I8, I8 (see Figures 4, 5 and 6) which extend longitudinally of the base Ibetween the upright side flanges 23a, 23a, of the base shoe 23 and the respective.

proximate rflanges of the channels I9, I9 which form part of the housing for the horizontal feedway for the staples. Said bars I8,l |8 arerpivoted attheir rear ends to the rear ends of the side fianges23a. of said shoe by transverse bolts 25,25, so as to be hinged to the baseat its rear end on an axis extending transversely of said base. Therear end of the handle II is also pivoted to said base on one'of 4said bolts 25. Thebars I8, I8 have horizontal flanges |8a, I8a which overlie the channels I9, I9.

A pad 36 (shown in perspective inFigure 8) is mounted at the front end of the base on the channel bars I9 in position to receive the blow of the plunger 28 when it reaches the end of' its downward driving movement, as shown in Figure 2. Said pad is in the form of part of a circular disk inserted back of the' path of said plunger, where it is Vheld in place by a rivet pin 38h.

From the foregoing description, it will be observed that the tubular head |2,` the supporting wingsIB, the handle I I andthe bars. I8 together constitute a unit frame which is movable upon an axis transverse ofthe base I@ provided by the bolts 25 at the rear end of said base.` Thus the head I2, the bottom end of which is normally in Contact with the top of the` base I0, as at |232, (see Figures 1, 2 and 3) is movable with said frame relative tothe base IU'at that point.

The operation of the device is as follows:- When a staple is to bedriven, the stapling machine is brought to proper position with the bottom wall of the base in contact with the surface intok which the staple is to be driven. The lever I3 is then operated to raise the plunger 28.to the upper limit of its movement, where it is released by the disengagement of thepawl I5. In this movement of the plunger the driving spring 3| is compressed, as indicated in Figures 3 and 4. Upon the release of the plunger the blade 22 is driven down through its passageway to drive the staple with the force resulting from the expansion Aof the coiledspring 3|.

The plunger 28 is arrested at the end of its stroke by the pad 36 carried at the front end of the base I8, to which the shock. of the blow aosns is transmitted through said pad. At this time, the plunger actuated spring 3| is expanded, as shown in Figure 6, but is still under compression. Since the cap 26, which acts as an abutment to resist the upward thrust of the spring 3|, is connected by the yoke 32 to the shoe 23 of the base I0, the reaction resulting from the shock due to the suddenarrest'of the'plunger, is to an extent absorbed and reduced through the plunger 28 by the driving spring 3|. In addition, said reaction of the base is communicated at |21: to the tubular head I2 in such manner as to swing the whole frame including the bars I8 upon the axis of the bolts 25. The inertia-of Said head I2 and the frame carrying it and the friction between said frame and the base are opposed to such movement and act to The movement of the head I2 withreferehce.

to the base Iand the plunger 28, held in engagementwith the base by the expanded spring 3i, is independent of the plunger and'base and is difficult of observation when the staple driving machine is normally operated. ButY that' such relative movement occurs isevidenced by the fact that the coiled spring Z'I'interposed between the cap 26 and the-top end of the'tubular head I2 is required in orderv to restore the head I2 and the frame of which itis a partV to their original position before the normal op'- eration of the staple driving machine maybe repeated.

I claim as my invention:-

1. In a staple driving machine, includingV a' base, a reciprocable plunger; a springfor actuatingV said plunger, a .seat'for'said spring, means rigidly connecting saidv seat to saidbase, and a frame including a tubular headin which said plunger is reciprocable, said head being' normally engaged with said base but` being movable with said frame frelative to saidbase.

2. Ina staple driving machine, includingy a base, a reciprocable plunger,A a spring for actuating said plunger, a seat for said spring, means rigidly connecting said seat to said base, a frame .including a` tubular head in which' saidplunger is reciprocable, said head being normally engaged with said base but being movable with saidframe relative to said base, andmeans for normally maintaining said head in engagement with said base.

3. In a staple driving machine,including a base, a reciprocable plunger, a spring. for actuating said plunger, a seat for said spring, means rigidly connecting said, seat to said base, and a frame including a tubular head in which said plunger is reciprocable, said head being normally engaged with said base but being movable with saidframe relative to said base about an axis transverse to the line of reciprocation of said. plunger and remote therefrom. Y

4. In a staple driving machine,'including a base; a reciprocable plunger, a spring for actuating said plunger, a seat for said spring, means rigidly connecting said'seat to said base, a frameincluding atubular head in whichv said plunger is reciprocable, said'head being normally engaged'with said base but beingmovable vwith said frame relative to said base about an axis transverse to the line of reciprocation of said plungerand remote therefrom, and means for normally maintaining said head in engagement with said base.

5. In a staple driving machine, including a base, a reciprocable plunger, a spring for actuating said plunger, a tubular cap providing an abutment for said spring, means rigidly connecting said cap to said base, and a frame including a tubular head in which said plunger is reciprocable and which is movable .relative to said cap, said head being normally engaged with said base but being movable with said frame relative to said base about an axis transverse to the line of reciprocation of said plunger and remote therefrom.

6. In a staple driving machine, including a base, a reciprocable plunger, a spring for actuating said plunger, a tubular cap providing an abutment for said spring, means rigidly connecting said cap to said base, a frame including a tubular head in which said plunger is reciprocable and which is movable relative to said cap, said head being normally engaged with said base but being movable with said frame relative to said base about an axis transverse to the line of reciprocation of said plunger and remote therefrom, and means for normally maintaining said head in engagement with said base.

'7. In a staple driving machine, including a base, a reciprocable plunger, a spring for actuating said plunger, a tubular cap providing an abutment for said spring, a yoke connecting said cap to said base, and a frame including a tubular head in which said plunger is reciprocable, said cap being telescoped upon said head, said head being normally engaged With said base but being movable with said frame relative. to said base about an axis transverse to the line of reciprocation of said plunger and remote therefrom.

8. In a staple driving machine, including a base, a reciprocable plunger, a spring for actuating said plunger, a tubular cap providing an abutment for said spring, a yoke connecting said cap to said base, a frame including a tubular head in which said plunger is reciprocable, said cap being telescoped upon said head, said head being normally engaged with said base but being movable with said frame relative to said base about an axis transverse to the line of reciprocation of said plunger and remote therefrom, and means for normally maintaining said head in engagement with saidbase.

9. In a staple driving machine, including a base, a reciprocable plunger, a spring for actuating said plunger, a tubular cap providing an abutment for said spring, a yoke connecting said cap to said base, a frame including a tubular head in. which said plunger is reciprocable, said cap being telescoped upon said head, said head being normally engaged with said base but being movable with said frame relative to said base about an axis transverse to the line of reciprocation of said plunger and remote therefrom, and an expansion spring interposed between said cap and said head.

AUGIE L. HANSEN. 

